TLD anycast clouds?

Wed Oct 5 06:54:03 UTC 2005

On Tue, 4 Oct 2005, Steve Gibbard wrote:

> I'm attempting to come up with a list of all the top level domain DNS servers

How are you attempting to do it?

One of the problems is that you need to check from multiple locations 
around the world because dns server would appear to be different depending 
on where you look at it from. When you look at this in case of ccTLD
you not only need to appear in different locations around the world, but 
it  would probably be good to check from multiple locations in that 
particular country. This makes administratively difficult to arrange
to do proper measurement for all the ccTLDs.

> that are anycasted.  I already know about the anycast clouds run by PCH, 
> Neustar, Verisign, DENIC, and UltraDNS, and .mx appears from traceroutes to 
> be anycasted as well.

I'm pretty sure ISC runs anycasted dns servers too and they run .museum 
TLD and serve as secondary for one or two other TLDs.

BTW - anyone can guess why lookup for SIG RR on .museum results in 
different response then for some other non-existant RR like NAPTR?

-bash-3.00$ dig museum sig
; flags: qr rd ra; QUERY: 1, ANSWER: 0, 
AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;museum.                                IN      SIG
;; Query time: 4 msec
;; SERVER: 216.151.192.1#53(216.151.192.1)

-bash-3.00$ dig museum naptr
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;museum.                                IN      NAPTR
;; AUTHORITY SECTION:
museum.                 3236    IN      SOA     nic.museum. 
hostmaster.nic.museum. 2005092312 28800 7200 1209600 3600
;; Query time: 4 msec
;; SERVER: 216.151.192.1#53(216.151.192.1)

-- 
William Leibzon
Elan Networks
william at elan.net